Diffusion

Students use a pH sensor to investigate the diffusion of hydrogen ions through a semipermeable membrane, comparing the rates of diffusion for two solutions that differ in their acidity.

Dialysis tubing sacs are filled with solutions that have different initial pH values. The sacs are placed in water and a pH probe is used to measure the change in water pH over time. Students determine if and how the difference in rate of pH change relates to the difference in initial pH of the solution in each sac. Students then consider variables other than initial pH that might affect the rate of H+ ion diffusion and design an experiment that tests the effect of that variable on the diffusion rate of a cell, using the beaker-tubing system to model the cell.

Grade Level: Advanced Placement • College • High School

Subject: Biology

Student Files

	Diffusion	7.82 KB
	Diffusion	233.63 KB
	Diffusion	353.10 KB
	Diffusion	7.20 KB

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Standards Correlations

IB® Topics	AP® Topics
1.4; 10.3	2-1.C; 2-2.C; 2-2.F; 2-2.I

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